package thread;

//     juc就是java.util.concurrent，并发包
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ThreadPoolDemo {
    public static void main(String[] args) {

        ExecutorService threadPool = Executors.newFixedThreadPool(3);

        for (int i = 0; i < 5; i++) {
            Runnable r = () -> {
                try {
                    Thread t = Thread.currentThread();
                    System.out.println(t.getName() + ":正在执行一个任务...");
                    Thread.sleep(5000);
                    System.out.println(t.getName() + ":执行任务完毕");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            };
            threadPool.execute(r);
            System.out.println("将一个任务交给了线程池");
        }

//        threadPool.shutdown();
        threadPool.shutdownNow();
        System.out.println("停止线程池");

    }
}
